111111200261 has 2 divisors, whose sum is σ = 111111200262. Its totient is φ = 111111200260.

The previous prime is 111111200219. The next prime is 111111200287. The reversal of 111111200261 is 162002111111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74839997761 + 36271202500 = 273569^2 + 190450^2 .

It is a cyclic number.

It is not a de Polignac number, because 111111200261 - 2³⁰ = 110037458437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111111208261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55555600130 + 55555600131.

It is an arithmetic number, because the mean of its divisors is an integer number (55555600131).

Almost surely, 2^111111200261 is an apocalyptic number.

It is an amenable number.

111111200261 is a deficient number, since it is larger than the sum of its proper divisors (1).

111111200261 is an equidigital number, since it uses as much as digits as its factorization.

111111200261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 17.

Adding to 111111200261 its reverse (162002111111), we get a palindrome (273113311372).

The spelling of 111111200261 in words is "one hundred eleven billion, one hundred eleven million, two hundred thousand, two hundred sixty-one".